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Sat, 19 Oct 2019 18:30:34 +0000 (GMT) Received: from swastik.ibm.com (unknown [9.85.146.216]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Sat, 19 Oct 2019 18:30:33 +0000 (GMT) Subject: Re: [PATCH v7 7/8] ima: check against blacklisted hashes for files with modsig To: Mimi Zohar , Nayna Jain , linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org References: <1570497267-13672-1-git-send-email-nayna@linux.ibm.com> <1570497267-13672-8-git-send-email-nayna@linux.ibm.com> <1570799995.5250.81.camel@linux.ibm.com> From: Nayna Message-ID: Date: Sat, 19 Oct 2019 14:30:33 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1570799995.5250.81.camel@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-19_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910190172 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel , Eric Ricther , linux-kernel@vger.kernel.org, Claudio Carvalho , Matthew Garret , Greg Kroah-Hartman , Paul Mackerras , Jeremy Kerr , Elaine Palmer , Oliver O'Halloran , George Wilson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi Mimi, On 10/11/2019 09:19 AM, Mimi Zohar wrote: > On Mon, 2019-10-07 at 21:14 -0400, Nayna Jain wrote: >> Asymmetric private keys are used to sign multiple files. The kernel >> currently support checking against the blacklisted keys. However, if the >> public key is blacklisted, any file signed by the blacklisted key will >> automatically fail signature verification. We might not want to blacklist >> all the files signed by a particular key, but just a single file. >> Blacklisting the public key is not fine enough granularity. >> >> This patch adds support for blacklisting binaries with appended signatures, >> based on the IMA policy. Defined is a new policy option >> "appraise_flag=check_blacklist". > The blacklisted hash is not the same as the file hash, but is the file > hash without the appended signature.  Are there tools for calculating > the blacklisted hash?  Can you provide an example? I have updated the patch description to specify that the blacklisted hash is the file hash without the appended signature. I hope that makes it clear now. Thanks & Regards,     - Nayna